Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments (Narrative) (Details)

v3.10.0.1
Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sales $ 55,686 $ 45,774 $ 154,834 $ 118,010
Unrealized Gains (Losses) on Cash Flow Hedges [Member]        
Maximum net exposure to company     614  
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]        
Sales $ 255 $ (422) $ (75) $ (36)